    <div class="refentry" id="glValidateProgram">
      <div class="titlepage"></div>
      <div class="refnamediv">
        <h2>Name</h2>
        <p>glValidateProgram — Validates a program object</p>
      </div>
      <div class="refsynopsisdiv">
        <h2>C Specification</h2>
        <div class="funcsynopsis">
          <table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
            <tr>
              <td>
                <code class="funcdef">void <strong class="fsfunc">glValidateProgram</strong>(</code>
              </td>
              <td>GLuint <var class="pdparam">program</var><code>)</code>;</td>
            </tr>
          </table>
          <div class="funcprototype-spacer"> </div>
        </div>
      </div>
      <div class="refsect1" id="parameters">
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>program</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>Specifies the handle of the program object to
                    be validated.</p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1" id="description">
        <h2>Description</h2>
        <p><code class="function">glValidateProgram</code> checks to see
        whether the executables contained in
        <em class="parameter"><code>program</code></em> can execute given the current
        OpenGL state. The information generated by the validation
        process will be stored in <em class="parameter"><code>program</code></em>'s
        information log. The validation information may consist of an
        empty string, or it may be a string containing information about
        how the current program object interacts with the rest of
        current OpenGL state. This provides a way for OpenGL
        implementers to convey more information about why the current
        program is inefficient, suboptimal, failing to execute, and so
        on.</p>
        <p>The status of the validation operation will be stored as
        part of the program object's state. This value will be set to
        <code class="constant">GL_TRUE</code> if the validation succeeded, and
        <code class="constant">GL_FALSE</code> otherwise. It can be queried by
        calling
        <a class="citerefentry" href="glGetProgramiv"><span class="citerefentry"><span class="refentrytitle">glGetProgramiv</span></span></a>
        with arguments <em class="parameter"><code>program</code></em> and
        <code class="constant">GL_VALIDATE_STATUS</code>. If validation is
        successful, <em class="parameter"><code>program</code></em> is guaranteed to
        execute given the current state. Otherwise,
        <em class="parameter"><code>program</code></em> is guaranteed to not execute.</p>
        <p>This function is typically useful only during application
        development. The informational string stored in the information
        log is completely implementation dependent; therefore, an
        application should not expect different OpenGL implementations
        to produce identical information strings.</p>
      </div>
      <div class="refsect1" id="notes">
        <h2>Notes</h2>
        <p>This function mimics the validation operation that OpenGL
        implementations must perform when rendering commands are issued
        while programmable shaders are part of current state. The error
        <code class="constant">GL_INVALID_OPERATION</code> will be generated by
        any command that triggers the rendering of geometry if:</p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem">
              <p>any two active samplers in the current program
                object are of different types, but refer to the same
                texture image unit,</p>
            </li>
            <li class="listitem">
              <p>the number of active samplers in the program exceeds the maximum
            number of texture image units allowed.</p>
            </li>
          </ul>
        </div>
        <p>It may be difficult or cause a performance degradation for
        applications to catch these errors when rendering commands are
        issued. Therefore, applications are advised to make calls to
        <code class="function">glValidateProgram</code> to detect these issues
        during application development.</p>
      </div>
      <div class="refsect1" id="errors">
        <h2>Errors</h2>
        <p><code class="constant">GL_INVALID_VALUE</code> is generated if
        <em class="parameter"><code>program</code></em> is not a value generated by
        OpenGL.</p>
        <p><code class="constant">GL_INVALID_OPERATION</code> is generated if
        <em class="parameter"><code>program</code></em> is not a program object.</p>
      </div>
      <div class="refsect1" id="associatedgets">
        <h2>Associated Gets</h2>
        <p><a class="citerefentry" href="glGetProgramiv"><span class="citerefentry"><span class="refentrytitle">glGetProgramiv</span></span></a>
        with arguments <em class="parameter"><code>program</code></em> and
        <code class="constant">GL_VALIDATE_STATUS</code></p>
        <p><a class="citerefentry" href="glGetProgramInfoLog"><span class="citerefentry"><span class="refentrytitle">glGetProgramInfoLog</span></span></a>
        with argument <em class="parameter"><code>program</code></em></p>
        <p>
          <a class="citerefentry" href="glIsProgram">
            <span class="citerefentry">
              <span class="refentrytitle">glIsProgram</span>
            </span>
          </a>
        </p>
      </div>
      {$pipelinestall}{$examples}
      <div class="refsect1" id="versions">
        <h2>API Version Support</h2>
        <div class="informaltable">
          <table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">
            <colgroup>
              <col style="text-align: left; "/>
              <col style="text-align: center; " class="firstvers"/>
              <col style="text-align: center; "/>
              <col style="text-align: center; " class="lastvers"/>
            </colgroup>
            <thead>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; ">

            </th>
                <th style="text-align: center; border-bottom: 2px solid ; " colspan="3">
                <span class="bold"><strong>OpenGL ES API Version</strong></span>
            </th>
              </tr>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>Function Name</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>2.0</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.0</strong></span>
            </th>
                <th style="text-align: center; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.1</strong></span>
            </th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td style="text-align: left; border-right: 2px solid ; ">glValidateProgram</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; ">✔</td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
      <div class="refsect1" id="seealso">
        <h2>See Also</h2>
        <p><a class="citerefentry" href="glLinkProgram"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a>,
        <a class="citerefentry" href="glUseProgram"><span class="citerefentry"><span class="refentrytitle">glUseProgram</span></span></a></p>
      </div>
      <div class="refsect1" id="Copyright">
        <h2>Copyright</h2>
        <p>
            Copyright © 2003-2005 3Dlabs Inc. Ltd.
            Copyright © 2010-2014 Khronos Group.
            This material may be distributed subject to the terms and conditions set forth in
            the Open Publication License, v 1.0, 8 June 1999.
            <a class="link" href="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.
        </p>
      </div>
    </div>
